Lock with means concealing mounting fasteners

ABSTRACT

A deadlock including a bolt housing and a cooperating strike element each having openings for reception of fastening means for anchoring the same one to a door and the other to a door frame. A bolt-operating knob on the housing conceals the fastening means when the bolt is in both its extended strike-engaging and retracted strike-releasing positions, the fastening means being exposed only when the bolt is moved to an intermediate position between its fully extended and retracted positions. A cover is press fitted on the strike to conceal the fastening means thereon.

United States Patent 785 340% 312 HUN 999mm 222 72] Inventor Russell W. Waldo St. Paul, Minn.

[21 Appl. No. 874,277

[22] Filed Nov. 5, 1969 [45] Patented May 25, 1971 [73] Assignee Ideal Security Hardware Corporation St. Paul, Minn.

FOREIGN PATENTS 7/1931 524,590 8/1940 GreatBritain................

353,721 Great Britain................ 292/140 292/150 L J .muw D. m w Amm S60 i H wwm ZC amr m a e m XM Ew mmw .mmm mmm m 0 M G m E m o a c n S g m .m E w a M m mm m K we LFw M w ABSTRACT: A deadlock including a bolt housing and a cooperating strike element each having openings for receptionof fastening means for anchoring the same one to a door and the other to a door frame. A bolt-operating knob on the housing conceals the fastening means when the bolt is in both its extended strike-engaging and retracted strike-releasing positions, the fastening means being exposed only when the bolt is moved to an intermediate position between its fully extended and retracted positions. A cover is press fitted on the strike to conceal the fastening means thereon.

[56] References Cited UNIT ED STATES PATENTS 1,924,806 8/1933 Saunders......................

Patented May 25, 1971 2 Sheets-Sheet 1 mvswrom fill-$551.1. bl. UnLoo HTTOHIVEYS Patented May 25, 1911 2 Sheets-Sheet 2 INVENTOR.

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LOCK WITH MEANS CONCEALING MOUNTING FASTENERS BACKGROUND OF THE INVENTION Deadlocks generally are well known, these being normally fastened, with their cooperating strike elements, to adjacent surfaces of doors and door frames respectively, usually by means of conventional anchoring screws. These screws have slotted heads that are exposed at all times, and the locks can be easily removed by thieves or vandals with the aid of a screwdriver or even a coin. Moreover, when a pleasing design of lock is desired, the design is not usually enhanced by the use of ordinary screwheads, and the cost of screws having omamental heads is substantially greater than the screws customarily used.

SUMMARY OF THE INVENTION The present invention involves a housing having a dead bolt mounted therein for extending and retracting movements into and out of locking engagement with a cooperating strike, the housing and strike having openings therein for reception of anchoring screws by means of which the housing and strike are secured each to one of a door and door frame. A knob is mounted on the housing and operatively connected to the dead bolt for imparting said extending-locking and retractingunlocking movements to the bolt. The housing-anchoring screws are so located, and the knob is so shaped, that portions of the knob overlie and conceals the anchoring screws when the dead bolt is fully extended to its locking position, as well as when the bolt is fully retracted'out of engagement with the strike. The anchoring screws are exposed only when the knob is manipulated to move the dead bolt to an intermediate position between its fully extended and fully retracted positions. A cover element for the strike is provided with portions which have a press fit with corresponding portions of the strike, the cover element substantially covering the strike and concealing the anchoring screws therefor. The cover element has a sidewall portion disposed in closely spaced relationship to an adjacent wall of the dead bolt housing when the door is closed, the sidewall portion of the cover element having a pair of notches therein for reception of a tool, such as a screwdriver, for removing the cover element when necessary. When the door is closed,-the notches are substantially concealed by the adjacent end of the dead bolt housing.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary view in front elevation of the dead lock of this invention mounted on a door and door frame;

FIG. 2 is a view corresponding to FIG. 1, but showing a different position of some of the parts, some parts being removed and some parts being shown in dotted lines;

FIG. 3 is an enlarged cross section taken substantially on the line 3-3 ofFlG. 2;

FIG. 4 is an enlarged fragmentary section taken substantially on the line 4-4 of FIG. 1;

FIG. 5 is-an enlarged transverse section taken substantially on the line 55 ofFlG. 1;

FIG. 6 is an enlarged view in side elevation, as seen from the line 6-6 ofFIG.1;

FIG. 7 is an enlarged view in rear elevation, some parts being broken away;

FIG. 8 is an enlarged fragmentary section taken substantially on the line 8-8 of FIG. I; and

FIG. 9 is an isometric view of the dead bolt-manipulating knob ofthis invention.

DETAILED DESCRIPTION A dead bolt housing, indicated generally at l, is shown as comprising a front wall 2, opposite longitudinal sidewalls 3, and inner and outer end walls 4 and 5 respectively. A rear cover plate 6 is provided with a plurality of openings 7 through which extend pins 8 integrally fonned with the housing I, the

pins 8 being riveted or peened in the openings 7, see FIG. 7. The strike, indicated generally at 9, is normally disposed in closely spaced relationship to the inner end wall 4 of the housing 1, one of the housing 1 and strike 9 being adapted to be mounted on a door, and the other on a door frame. In the arrangement illustrated, the housing 1 is shown as being mounted on a door 10, shown fragmentarily in FIGS. 1 and 8, the strike 8 being mounted on a door frame 11, shown fragmentarily in FIGS. 1 and 4-6.

An elongated dead bolt 12 is longitudinally slidably mounted in the housing 1 for movements between a retracted position shown by full lines in FIG. 7 and a fully extended position shown by dotted lines in FIG. 7, in which fully extended position the outer end 13 of the bolt 12 is received within the strike 9. Intermediate its. ends, the dead bolt 12 is formed to provide an elongated opening 14 and a forwardly opening notch 15, the slot 14 receiving a bearing boss 16 integrally formed with the housing 1. A lock-operating knob 17 is provided with an axial shaft 18 that is journaled in the boss 16, the knob 17 further being provided with a dead bolt-engaging lug 19 that projects rearwardly through an arcuate or segmental opening 20 in the front wall 2 of the housing 1 and into the notch 15 of the dead bolt 12. With this arrangement, rotation of the knob 17 in opposite directions imparts longitudinal sliding movement to the dead bolt 12 between its extended and retracted positions. A detent 21 is mounted in the housing 1 for sliding movements transversely of the direction of movement of the dead bolt 12, and is yieldingly urged toward engagement with the dead bolt 12 by a coil compression spring 22. The detect 21 has a rounded inner end 23 that is received in one of a pair of outwardly opening notches or recesses 24 in the adjacent side of the dead bolt 12 at the fully extendedtor retracted positions of movement'of the dead bolt 12.

The dead bolt 12 has a reduced inner end 25 that is formed to provide a pair of longitudinally spaced notches 26 and 27' that are adapted to selectively receive a locking pin 28 of a conventional cylinder lock 29. The cylinder lock 29 is limited in its extent of rotary movement in one direction by engagement of the pin 28 with the end portion 25 of the dead bolt 12 within the notch 26 when the dead bolt is retracted, and with the end portion 25 within the notch 27 when the dead bolt is extended to its locking position. Rotary movement of the cylinder lock 29 is limited in the opposite direction by engagement of the locking pin 28 thereof with a stop lug or ear 30 integrally formed with the housing 1. With this arrangement, the dead bolt 12 may be keylocked in either its retracted or extended positions.

As shown in FIGS. I3 and 8, the outer surface of the front wall 1 is formed to provide a circular recess 31 which receives the axially inner portion of the knob 17. The knob 17 is formed to provide a plurality, as shown four, of circumferentially spaced radially outwardly projecting portions or wings 32 that are disposed in the recess 31. Rearwardly of the recess 31 and within the confines thereof, the housing 1 is formed to provide a plurality of circumferentially spaced rearwardly extending bosses 33 having axial openings 34 therethrough that are countersunk within the recess 31, as indicated at 35 for reception of anchoring screws 36 by means.

of which the housing 1 is rigidly secured to the door 10. The rear cover plate 6 is provided with openings 37 aligned with the openings 34 for passage of the screws 36 therethrough. The anchoring screws 36 are like in number and spacing circumferentially of the recess 31 to the number of wings 32 on the knob 17, and are so disposed relative to the wings 32 that when the knob 17 is rotated to positions wherein the dead bolt 12 is either fully retracted or fully extended, the wings 32 each overlie and conceal a different one of the screws 36, as shown in FIG. I. The heads of the screws 36 are exposed to view forinstallation or removal of the deadlock only when the knob 17 is turned to a position wherein the dead bolt 12 is disposed generally centrally between its fully extended and fully retracted positions, as shown in FIG. 2.

The strike 9 comprises a central portion 38 which defines a dead bolt-receiving cavity 39, and a pair of spaced lugs 40 having countersunk openings 41 therethrough and recess portions 42 extending outwardly or forwardly from axially aligned with the openings 41. A pair of anchoring screws 43 extend rearwardly through the countersunk openings 41 and are screw threadedly received in the door frame 11. lt will be appreciated that the strike 9 is of the so-called surface type that is mounted on a door frame surface coplanar with that of the door on which the housing 1 is mounted.

A cover element for the strike 9 is indicated generally at 44 and is formed to provide a front wall 45, inner and outer sidewalls 46 and 47 respectively and end walls 48. Internally, the cover element 44 is provided with a pair of rearwardly projecting lugs or bosses 49 having a width substantially equal to the diameter of the recesses 42, the width of the bosses 49 being such that, when the cover element 44 is applied to the strike 9, the bosses 49 will be press fitted each in a different one of said recesses 42. The sidewall 46 is formed to provide a generally central opening 50 through which the outer end portions 13 of the dead bolt 12 is adapted to move into and out of the cavity 39 in the strike 8. Further, the sidewall 46 is formed to provide a pair of notches 51 at opposite sides of the opening 50 for reception of a screwdriver or other tool which may be used to pry the cover element 44 out of engagement with the strike 8 when it is desired to remove the strike for replacement or other purposes. it will be readily seen from the drawings that the sidewall 46 of the cover element 44 is disposed in closely spaced relationship to the end wall 4 of the housing 1 when the door is closed, and that the mounting screws 43 are effectively concealed by the cover element 44. The notches 51 are also concealed and inaccessible when the door 10 is closed, and are very inconspicuous when the door is open.

The above-described deadlock provides an assembly having a neat unobtrusive appearance unmarred by the appearance of screwheads in the normal positions of the dead bolt. Moreover, as above indicated, concealing of the mounting screws in the manner described as a deterring effect on vandals or thieves who might desire to remove the deadlock and its cooperating strike.

What I claim is:

l. A lock comprising:

a. a housing having a plurality of transverse openings therethrough for reception of fastening means for anchoring said housing to one of a pair of relatively movable and relatively fixed members;

b. a bolt slidably movable in said housing between extended locking and retracted unlocking positions relative to said housing;

c. and bolt-moving means including a shaft rotatably supported by said housing and a knob on said shaft exterior of said housing for imparting extending and retracting movements to said bolt;

d. said knob having portions overlying and concealing said housing openings in both extended and retracted positions of said bolt, said portions being displaced from overlying relationship to said openings only in a position of said bolt intermediate said extended and retracted positions thereof.

2. The lock according to claim 1, characterized by a keyoperated rotary locking device mounted in said housing, said locking device and bolt having interengaging portions for releasably locking said bolt in either one of its extended or retracted positions responsive to predetermined rotation of said locking device from a neutral bolt-released position.

3. The lock according to claim 1, in which said fastening receiving openings are circumferentially spaced radially outwardly of the axis of said shaft and disposed generally parallel to said axis.

4. The lock according to claim 3, in which said knob portions comprise circumferentially spaced wing elements projectin radial] outwardly from said knob.

5. The loc according to claim 3, in which said housing defines an outwardly opening circular recess coaxial with said shaft, said fastening receiving openings being disposed within the confines of said recess, said knob portions comprising circumferentially spaced wing elements projecting radially outwardly from said knob within said recess.

6. The lock accordingto claim 3, in which said bolt-moving means includes a lug on one of said knob and bolt radially outwardly spaced from the axis of said shaft and a notch on the other of said knob and bolt for reception of said lug.

7. The lock according to claim 6, characterized by a latch detent on one of said bolt and housing, the other of said bolt and housing defining a pair of recesses spaced apart in a direction longitudinally of the direction of travel of said bolt, said detent being received in said recesses selectively to releasably hold said bolt in a selected one of said extended and retracted positions thereof.

8. The lock according to claim 1, characterized by a strike element defining a cavity for reception of an adjacent end portion of said bolt when said bolt is moved to its extended position, said strike element having a pair of laterally spaced openings for reception of fastening means for anchoring the strike element to the other one of said pair of relatively movable and relatively fixed members, and a cover element for said strike element, said cover and strike elements including interengaging portions having a press fit there between, said cover element concealing said laterally spaced openings and the fastening means therein when mounted on said strike element.

9. The lock according to claim 8 in which said interengaging portions include a pair of recesses in one of said strike and cover elements and a pair of bosses on the other of said strike and cover elements press fitted in said recesses.

10. The lock according totclaim 8 in which said cover element includes a sidewall portion defining a bolt-receiving opening aligned with said cavity, said sidewall portion being disposed in closely spaced relationship to said housing when the housing and strike and cover elements are anchored to said movable and fixed members and when said members are disposed in a closed lockable relationship, said sidewall portion defining a pair of notches adjacent said bolt-receiving opening for reception of a cover element-removing tool, said notches being substantially concealed by said housing when said movable and fixed members are in said closed lockable relationship. 

1. A lock comprising: a. a housing having a plurality of transverse openings therethrough for reception of fastening means for anchoring said housing to one of a pair of relatively movable and relatively fixed members; b. a bolt slidably movable in said housing between extended locking and retracted unlocking positions Relative to said housing; c. and bolt-moving means including a shaft rotatably supported by said housing and a knob on said shaft exterior of said housing for imparting extending and retracting movements to said bolt; d. said knob having portions overlying and concealing said housing openings in both extended and retracted positions of said bolt, said portions being displaced from overlying relationship to said openings only in a position of said bolt intermediate said extended and retracted positions thereof.
 2. The lock according to claim 1, characterized by a key-operated rotary locking device mounted in said housing, said locking device and bolt having interengaging portions for releasably locking said bolt in either one of its extended or retracted positions responsive to predetermined rotation of said locking device from a neutral bolt-released position.
 3. The lock according to claim 1, in which said fastening receiving openings are circumferentially spaced radially outwardly of the axis of said shaft and disposed generally parallel to said axis.
 4. The lock according to claim 3, in which said knob portions comprise circumferentially spaced wing elements projecting radially outwardly from said knob.
 5. The lock according to claim 3, in which said housing defines an outwardly opening circular recess coaxial with said shaft, said fastening receiving openings being disposed within the confines of said recess, said knob portions comprising circumferentially spaced wing elements projecting radially outwardly from said knob within said recess.
 6. The lock according to claim 3, in which said bolt-moving means includes a lug on one of said knob and bolt radially outwardly spaced from the axis of said shaft and a notch on the other of said knob and bolt for reception of said lug.
 7. The lock according to claim 6, characterized by a latch detent on one of said bolt and housing, the other of said bolt and housing defining a pair of recesses spaced apart in a direction longitudinally of the direction of travel of said bolt, said detent being received in said recesses selectively to releasably hold said bolt in a selected one of said extended and retracted positions thereof.
 8. The lock according to claim 1, characterized by a strike element defining a cavity for reception of an adjacent end portion of said bolt when said bolt is moved to its extended position, said strike element having a pair of laterally spaced openings for reception of fastening means for anchoring the strike element to the other one of said pair of relatively movable and relatively fixed members, and a cover element for said strike element, said cover and strike elements including interengaging portions having a press fit there between, said cover element concealing said laterally spaced openings and the fastening means therein when mounted on said strike element.
 9. The lock according to claim 8 in which said interengaging portions include a pair of recesses in one of said strike and cover elements and a pair of bosses on the other of said strike and cover elements press fitted in said recesses.
 10. The lock according to claim 8 in which said cover element includes a sidewall portion defining a bolt-receiving opening aligned with said cavity, said sidewall portion being disposed in closely spaced relationship to said housing when the housing and strike and cover elements are anchored to said movable and fixed members and when said members are disposed in a closed lockable relationship, said sidewall portion defining a pair of notches adjacent said bolt-receiving opening for reception of a cover element-removing tool, said notches being substantially concealed by said housing when said movable and fixed members are in said closed lockable relationship. 